FEY-1(FEF-1)FEF-2風管止回閥

止回閥一般用在空(kong)調(diao)管道中，是(shi)使(shi)風機停轉后防止氣體倒流，要求風速不小于8米/秒時(shi)(shi)使(shi)用。訂貨(huo)時(shi)(shi)需(xu)要說明是(shi)垂(chui)直安(an)裝(zhuang)(zhuang)還是(shi)水平安(an)裝(zhuang)(zhuang)，水平安(an)裝(zhuang)(zhuang)時(shi)(shi)要加裝(zhuang)(zhuang)重錘，用以平衡上部葉片啟閉靈(ling)活(huo)。

    止回(hui)(hui)閥用于(yu)住(zhu)宅廚房、衛生間集中(zhong)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)排(pai)(pai)氣(qi)(qi)(qi)(qi)道的(de)一種(zhong)閥門，起到排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)、防回(hui)(hui)煙(yan)(yan)(yan)(yan)(yan)(yan)、防火的(de)功能(neng)。傳統的(de)防火止回(hui)(hui)閥大(da)都是葉(xie)片(pian)(pian)的(de)轉軸在(zai)進(jin)煙(yan)(yan)(yan)(yan)(yan)(yan)口的(de)中(zhong)上部(bu)，排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)機開(kai)(kai)啟(qi)時(shi)可吹開(kai)(kai)葉(xie)片(pian)(pian)，但煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)這時(shi)進(jin)入排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)道后會在(zai)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)道的(de)下(xia)部(bu)流(liu)(liu)動(dong)，由于(yu)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)道內(nei)的(de)氣(qi)(qi)(qi)(qi)流(liu)(liu)都應是往上流(liu)(liu)動(dong)的(de)，當上升(sheng)的(de)氣(qi)(qi)(qi)(qi)流(liu)(liu)遇(yu)到向下(xia)的(de)氣(qi)(qi)(qi)(qi)流(liu)(liu)時(shi)阻力會增加(jia)，上升(sheng)氣(qi)(qi)(qi)(qi)流(liu)(liu)的(de)流(liu)(liu)速(su)就會降低(di)，排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)能(neng)力受到影響，當同一根排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)道上上升(sheng)氣(qi)(qi)(qi)(qi)流(liu)(liu)的(de)阻力足夠大(da)時(shi)該排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)系統就無法排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)了，這時(shi)回(hui)(hui)煙(yan)(yan)(yan)(yan)(yan)(yan)的(de)現(xian)象(xiang)就會出現(xian)，對開(kai)(kai)沒開(kai)(kai)啟(qi)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)(yan)機的(de)住(zhu)戶來說就會有(you)別(bie)人(ren)家的(de)煙(yan)(yan)(yan)(yan)(yan)(yan)氣(qi)(qi)(qi)(qi)進(jin)入他(ta)的(de)家中(zhong)，煩人(ren)的(de)事(shi)就開(kai)(kai)始了。

     現有一種排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)防火止(zhi)回(hui)閥，轉軸位于進(jin)煙(yan)(yan)(yan)(yan)(yan)口的(de)(de)下部，他的(de)(de)轉軸是活(huo)動的(de)(de)，當排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)機開啟(qi)時，葉(xie)片(pian)(pian)(pian)的(de)(de)底邊(bian)轉動使(shi)葉(xie)片(pian)(pian)(pian)打(da)開，氣流斜(xie)著朝上流動進(jin)入排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)道(dao)，進(jin)入排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)道(dao)后(hou)對(dui)(dui)排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)道(dao)內(nei)上升的(de)(de)氣流影響較(jiao)小，排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)就會(hui)很順暢，排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)量(liang)也會(hui)很大，排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)機的(de)(de)噪聲就相對(dui)(dui)較(jiao)小。當排(pai)(pai)煙(yan)(yan)(yan)(yan)(yan)機關(guan)閉后(hou)葉(xie)片(pian)(pian)(pian)的(de)(de)下部設(she)的(de)(de)配重(zhong)就會(hui)把葉(xie)片(pian)(pian)(pian)拉回(hui)來達到關(guan)閉止(zhi)回(hui)的(de)(de)功能。對(dui)(dui)過適當的(de)(de)配重(zhong)設(she)置可以使(shi)葉(xie)片(pian)(pian)(pian)的(de)(de)開啟(qi)角度(du)接近90度(du)。